Stock Options and Restricted Stock - Summary of Activity for Stock Option Programs (Detail) - $ / shares		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options beginning balance		144,666		320,626	345,518
Granted		449,450		39,000	29,666
Cancelled		(44,076)		(214,960)	(54,558)
Exercised	[1]	0		0	0
Number of options ending balance		550,040	[2]	144,666	320,626
Options exercisable		62,778	[2]	81,889	273,960
Exercise price per share, lower range limit beginning balance		$ 2.14		$ 2.14	$ 7.10
Exercise price per share, upper range limit beginning balance		13.84		13.84	13.84
Exercise price per share, exercised	[1]	0		0	0
Exercise price per share, lower range limit ending balance		2.14	[2]	2.14	2.14
Exercise price per share, upper range limit ending balance		13.53	[2]	13.84	13.84
Exercise price per share, option exercisable lower range limit		2.14	[2]	2.14	7.10
Exercise price per share, option exercisable upper range limit		13.53	[2]	13.84	13.84
Weighted average exercise price, beginning balance		7.23		8.78	9.67
Weighted average exercise price, granted		6.61		5.46	2.35
Weighted average exercise price, cancelled		9.00		9.22	10.94
Weighted average exercise price, exercised	[1]	0		0	0
Weighted average exercise price, ending balance		6.58	[2]	7.23	8.78
Weighted average exercise price, options exercisable		7.60	[2]	9.25	9.50
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share, granted		5.21		5.27	2.14
Exercise price per share, cancelled		6.55		9.22	10.76
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share, granted		7.25		5.58	2.61
Exercise price per share, cancelled		$ 13.84		$ 9.24	$ 11.21

[1] The aggregate intrinsic value, which represents the difference between the price of the Company’s common stock at the exercise date and the related exercise price of the underlying options, was $0 for 2019, 2018, and 2017.

[2] The aggregate intrinsic value, which represents the difference between the price of the Company’s common stock at December 31, 2019 and the related exercise price of the underlying options, was $512,000 for outstanding options and $111,000 for exercisable options as of December 31, 2019. The remaining contractual life was 8.87 years for outstanding options and 5.95 years for exercisable options at December 31, 2019.